/* ==========================================================================
   AMEVA Ecosystem - Canonical Library Documentation Design System (SSOT)
   Version: 1.0.0 (Engine-v1)
   Architecture: High-Clarity Enterprise Open-Source (Apache/Tomcat Tech Hybrid)
   Standard: 58px Fixed Header (2px #004499 line), 270px Fixed Left Sidebar,
             980px Content, Crisp Monospace, Zero-Emoji Sober Engineering Theme
   ========================================================================== */

:root {
  /* Brand Tokens */
  --primary-color: #004499;
  --primary-dark: #002b66;
  --primary-light: #e8f0fe;
  --accent-cyan: #00f5d4;
  --accent-blue: #2563eb;
  --accent-amber: #b45309;
  --accent-green: #16a34a;

  /* Surfaces & Backgrounds */
  --bg-main: #ffffff;
  --bg-surface: #f8f9fa;
  --bg-alt: #f1f5f9;
  --bg-card: #ffffff;

  /* Borders & Dividers */
  --border-color: #cbd5e1;
  --border-subtle: #e2e8f0;
  --border-strong: #94a3b8;

  /* Typography Colors */
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;

  /* Code & Terminals */
  --code-bg: #0b132b;
  --code-text: #f8fafc;
  --code-border: #1e293b;

  /* Layout Metrics */
  --sidebar-width: 270px;
  --header-height: 58px;
  --content-max-width: 980px;

  /* Fonts */
  --font-sans: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "맑은 고딕", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Top Header ──────────────────────────────────────────────────────────── */
header {
  background-color: var(--bg-surface);
  border-bottom: 2px solid var(--primary-color);
  padding: 0 28px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.header-brand img {
  width: 28px;
  height: 28px;
  object-fit: contain;
}

.header-brand h1 {
  margin: 0;
  color: var(--primary-color);
  font-size: 1.25em;
  font-weight: 700;
  letter-spacing: -0.3px;
  font-family: var(--font-sans);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.release-tag {
  background-color: var(--primary-light);
  color: var(--primary-color);
  padding: 4px 10px;
  border: 1px solid #bfdbfe;
  border-radius: 4px;
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 0.82em;
}

.lang-select {
  padding: 5px 8px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  font-size: 0.84em;
  background-color: #ffffff;
  color: var(--text-main);
  cursor: pointer;
  font-weight: 500;
  outline: none;
}

.lang-select:focus {
  border-color: var(--primary-color);
}

.header-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: 0.82em;
  font-weight: 600;
  text-decoration: none;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  background-color: #ffffff;
  color: var(--text-main);
  transition: all 0.15s ease-in-out;
}

.header-btn:hover {
  background-color: var(--bg-alt);
  border-color: var(--text-muted);
}

.header-btn.primary {
  background-color: var(--primary-color);
  color: #ffffff;
  border-color: var(--primary-dark);
}

.header-btn.primary:hover {
  background-color: var(--primary-dark);
}

.header-btn.npm-btn {
  background-color: #cb3837;
  color: #ffffff;
  border-color: #a82d2c;
}

.header-btn.npm-btn:hover {
  background-color: #a82d2c;
}

.menu-toggle-btn {
  display: none !important;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
}

@media (max-width: 960px) {
  .menu-toggle-btn {
    display: inline-flex !important;
  }
}

/* ── Container Layout ────────────────────────────────────────────────────── */
.container {
  display: flex;
  min-height: calc(100vh - var(--header-height) - 48px);
}

/* ── Sidebar Navigation ─────────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  padding: 24px 16px;
  flex-shrink: 0;
  overflow-y: auto;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
}

.sidebar h3 {
  font-size: 0.75em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-subtle);
  margin-top: 20px;
  margin-bottom: 8px;
  padding-left: 10px;
  border-left: 2px solid var(--primary-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.sidebar h3 .accordion-icon {
  font-size: 10px;
  color: var(--text-subtle);
  margin-right: 4px;
}

.sidebar ul.collapsed {
  display: none;
}

.sidebar h3:first-of-type {
  margin-top: 4px;
}

.sidebar ul {
  list-style: none;
  margin-bottom: 16px;
}

.sidebar li {
  margin-bottom: 2px;
}

.sidebar a {
  display: block;
  padding: 6px 12px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.88em;
  font-weight: 500;
  transition: background-color 0.12s, color 0.12s;
}

.sidebar a:hover {
  background-color: var(--bg-alt);
  color: var(--primary-color);
}

.sidebar a.active {
  background-color: var(--primary-light);
  color: var(--primary-color);
  font-weight: 600;
}

/* ── Main Content Area ───────────────────────────────────────────────────── */
.content {
  flex-grow: 1;
  max-width: var(--content-max-width);
  padding: 36px 44px;
  margin: 0 auto;
}

.content h2 {
  font-size: 1.85em;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 6px;
  letter-spacing: -0.5px;
}

.content p.subtitle {
  font-size: 1.05em;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}

.content h3 {
  font-size: 1.3em;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 36px;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
}

.content h4 {
  font-size: 1.08em;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 20px;
  margin-bottom: 8px;
}

.content p {
  color: var(--text-muted);
  margin-bottom: 14px;
  line-height: 1.65;
}

.content a {
  color: var(--primary-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.content a:hover {
  color: var(--primary-dark);
}

.content ul, .content ol {
  margin-left: 20px;
  margin-bottom: 16px;
  color: var(--text-muted);
}

.content li {
  margin-bottom: 6px;
}

/* ── Badges Bar ─────────────────────────────────────────────────────────── */
.badges-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  align-items: center;
}

.badges-bar a {
  text-decoration: none;
  display: inline-flex;
}

.badges-bar img {
  height: 20px;
  vertical-align: middle;
  border-radius: 3px;
}

/* ── Alert Boxes ────────────────────────────────────────────────────────── */
.alert {
  padding: 14px 18px;
  border-radius: 4px;
  margin: 20px 0;
  border-left: 4px solid var(--primary-color);
  background-color: var(--bg-surface);
}

.alert .alert-title {
  display: block;
  font-weight: 700;
  font-size: 0.9em;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
  color: var(--primary-dark);
}

.alert-tip {
  border-left-color: var(--accent-blue);
  background-color: #f0f7ff;
}

.alert-tip .alert-title {
  color: var(--accent-blue);
}

.alert-warning {
  border-left-color: var(--accent-amber);
  background-color: #fffbeb;
}

.alert-warning .alert-title {
  color: var(--accent-amber);
}

.alert-success {
  border-left-color: var(--accent-green);
  background-color: #f0fdf4;
}

.alert-success .alert-title {
  color: var(--accent-green);
}

/* ── Features Card Grid ─────────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0 28px 0;
}

.feature-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 20px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.feature-card:hover {
  border-color: var(--primary-color);
  box-shadow: 0 2px 8px rgba(0, 68, 153, 0.08);
}

.feature-card h4 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--primary-dark);
  font-size: 1.02em;
  font-weight: 700;
}

.feature-card p {
  font-size: 0.9em;
  margin-bottom: 0;
  color: var(--text-muted);
}

/* ── Data Tables ────────────────────────────────────────────────────────── */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.9em;
}

.data-table th, .data-table td {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.data-table th {
  background-color: var(--bg-surface);
  font-weight: 600;
  color: var(--primary-dark);
  border-bottom: 2px solid var(--primary-color);
}

.data-table tr:nth-child(even) {
  background-color: #fafbfc;
}

.data-table tr:hover {
  background-color: #f1f5f9;
}

.status-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 0.8em;
  font-weight: 600;
  font-family: var(--font-mono);
}

.status-badge.active {
  background-color: #dcfce7;
  color: #166534;
}

.status-badge.beta {
  background-color: #fef3c7;
  color: #92400e;
}

/* ── Code Blocks & Tabs ─────────────────────────────────────────────────── */
.code-tab-group {
  margin: 18px 0;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--code-border);
}

.code-tabs-header {
  background-color: #1e293b;
  display: flex;
  padding: 0 8px;
  gap: 2px;
}

.code-tab-btn {
  background: none;
  border: none;
  color: #94a3b8;
  padding: 8px 14px;
  font-size: 0.82em;
  font-family: var(--font-mono);
  font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: color 0.12s;
}

.code-tab-btn:hover {
  color: #f8fafc;
}

.code-tab-btn.active {
  color: #ffffff;
  border-bottom-color: var(--accent-cyan);
}

pre {
  background-color: var(--code-bg);
  color: var(--code-text);
  padding: 16px 20px;
  border-radius: 4px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9em;
  line-height: 1.55;
  margin: 14px 0;
  position: relative;
  border: 1px solid var(--code-border);
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

p code, li code, td code {
  background-color: var(--bg-alt);
  color: var(--primary-dark);
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--border-subtle);
}

.copy-code-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background-color: rgba(255, 255, 255, 0.1);
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 4px 8px;
  font-size: 0.75em;
  font-family: var(--font-mono);
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
}

.copy-code-btn:hover {
  background-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 16px 28px;
  text-align: center;
  font-size: 0.84em;
  color: var(--text-subtle);
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 860px) {
  .container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
  }
  .content {
    padding: 24px 20px;
  }
  header {
    padding: 0 16px;
    height: auto;
    min-height: var(--header-height);
    flex-wrap: wrap;
    padding-top: 8px;
    padding-bottom: 8px;
  }
  .header-controls {
    margin-top: 6px;
  }
}